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Finding mass of object

  1. Feb 3, 2012 #1
    1. The problem statement, all variables and given/known data

    An object with a net charge of 18 µC is placed in a uniform electric field of 597 N/C, directed vertically. What is the mass of the object if it floats in the electric field?

    2. Relevant equations

    F=kq1q2/r^2

    3. The attempt at a solution
    dont understand at all
     
  2. jcsd
  3. Feb 3, 2012 #2

    rock.freak667

    User Avatar
    Homework Helper

    Ok, start with the first statement, they said the electric field is directed upwards. So what force is upwards?

    Naturally what force will be exerted on the mass downwards?

    Now put these two equal to each other.
     
  4. Feb 3, 2012 #3
    thank you i solved it
     
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